Legal claims defining the scope of protection, as filed with the USPTO.
1. A semiconductor device comprising: a photosensor; a light source; and a controller, wherein the light source is configured to irradiate paper with light, wherein the photosensor is configured to detect the light reflected by the paper, and wherein the controller is configured to lower the luminance of the light from the light source when the luminance of the light detected by the photosensor is higher than a first value and to increase the luminance of the light from the light source when the luminance of the light detected by the photosensor is lower than a second value.
2. The semiconductor device according to claim 1 , wherein the light source comprises an LED.
3. The semiconductor device according to claim 1 , further comprising: an A/D converter configured to convert data of the paper into a digital signal; and a bit count measurement portion configured to count a bit count number of each bit of the digital signal.
4. The semiconductor device according to claim 1 , further comprising a pixel electrode for displaying an image, wherein the light source is configured to irradiate the paper with the light through the pixel electrode.
5. The semiconductor device according to claim 4 , further comprising a thin film transistor, wherein the thin film transistor is electrically connected to the pixel electrode, and wherein the photosensor and the thin film transistor overlap with each other.
6. A semiconductor device comprising: an input portion comprising a photosensor; a light source; an A/D converter; a bit count measurement portion; and a controller, wherein the light source is configured to irradiate paper with light, wherein the input portion is configured to capture data of the paper by receiving the light reflected from the paper by the photosensor, wherein the A/D converter is configured to convert the data of the paper into a digital signal, wherein the bit count measurement portion is configured to count a bit count number of each bit of the digital signal, and wherein the controller is configured to lower the luminance of the light from the light source when the bit count number is higher than a first value and to increase the luminance of the light from the light source when the bit count number is lower than a second value.
7. The semiconductor device according to claim 6 , wherein the light source comprises an LED.
8. The semiconductor device according to claim 6 , wherein the data of the paper is image data.
9. The semiconductor device according to claim 6 , further comprising a pixel electrode for displaying an image, wherein the light source is configured to irradiate the paper with the light through the pixel electrode.
10. The semiconductor device according to claim 9 , further comprising a thin film transistor, wherein the thin film transistor is electrically connected to the pixel electrode, and wherein the photosensor and the thin film transistor overlap with each other.
11. The semiconductor device according to claim 6 , wherein the controller is configured to adjust luminance of the light from the light source so that the bit count number of a central bit is the highest.
12. The semiconductor device according to claim 6 , wherein the controller is configured to adjust luminance of the light from the light source so that an average of the bit count number comes to a medium value of a maximum value of the bit count number.
13. A display device comprising: a display panel comprising a display element and a photosensor; a backlight; an A/D converter; a bit count measurement portion; and a controller, wherein the backlight is configured to irradiate paper with light, wherein the display panel is configured to capture data of the paper by receiving the light reflected from the paper by the photosensor, wherein the A/D converter is configured to convert the data of the paper into a digital signal, wherein the bit count measurement portion is configured to count a bit count number of each bit of the digital signal, and wherein the controller is configured to lower the luminance of the light from the backlight when the bit count number is higher than a first value and to increase the luminance of the light from the backlight when the bit count number is lower than a second value.
14. The display device according to claim 13 , wherein the backlight comprises an LED.
15. The display device according to claim 13 , wherein the data of the paper is image data.
16. The display device according to claim 13 , further comprising a pixel electrode for displaying an image, wherein the backlight is configured to irradiate the paper with the light through the pixel electrode.
17. The display device according to claim 16 , further comprising a thin film transistor, wherein the thin film transistor is electrically connected to the pixel electrode, and wherein the photosensor and the thin film transistor overlap with each other.
18. The display device according to claim 13 , wherein the controller is configured to adjust luminance of the light from the backlight so that the bit count number of a central bit is the highest.
19. The display device according to claim 13 , wherein the controller is configured to adjust luminance of the light from the backlight so that an average of the bit count number comes to a medium value of a maximum value of the bit count number.
20. The display device according to claim 13 , wherein the display element is a liquid crystal element or an EL element.
21. A semiconductor device comprising: a photosensor; a light source; and a controller, wherein the light source is configured to irradiate a human finger with light, wherein the photosensor is configured to detect the light reflected by the human finger, and wherein the controller is configured to lower the luminance of the light from the light source when the luminance of the light detected by the photosensor is higher than a first value and to increase the luminance of the light from the light source when the luminance of the light detected by the photosensor is lower than a second value.
22. The semiconductor device according to claim 21 , wherein the light source comprises an LED.
23. The semiconductor device according to claim 21 , further comprising: an A/D converter configured to convert data of the human finger into a digital signal; and a bit count measurement portion configured to count a bit count number of each bit of the digital signal.
24. The semiconductor device according to claim 21 , further comprising a pixel electrode for displaying an image, wherein the light source is configured to irradiate the human finger with the light through the pixel electrode.
25. The semiconductor device according to claim 24 , further comprising a thin film transistor, wherein the thin film transistor is electrically connected to the pixel electrode, and wherein the photosensor and the thin film transistor overlap with each other.
26. A semiconductor device comprising: a light source; a first substrate over the light source; a photosensor over the first substrate; a second substrate over the photosensor; and a controller, wherein the semiconductor device is configured such that light from the light source enters through the first substrate and exits from the second substrate, wherein the semiconductor device is configured such that light from the second substrate enters the photosensor and is detected by the photosensor, and wherein the controller is configured to lower the luminance of the light from the light source when the luminance of the light detected by the photosensor is higher than a first value and to increase the luminance of the light from the light source when the luminance of the light detected by the photosensor is lower than a second value.
27. The semiconductor device according to claim 26 , wherein the light source comprises an LED.
28. The semiconductor device according to claim 26 , further comprising: an A/D converter configured to convert data of the light detected by the photosensor into a digital signal; and a bit count measurement portion configured to count a bit count number of each bit of the digital signal.
29. The semiconductor device according to claim 26 , further comprising a pixel electrode for displaying an image, wherein the light from the light source exits from the second substrate through the pixel electrode.
30. The semiconductor device according to claim 29 , further comprising a thin film transistor, wherein the thin film transistor is electrically connected to the pixel electrode, and wherein the photosensor and the thin film transistor overlap with each other.
31. The semiconductor device according to claim 1 , wherein a light-emitting element serves as the light source, and wherein the semiconductor device has a function of displaying an image by applying voltage to the light-emitting element.
32. The semiconductor device according to claim 6 , wherein a light-emitting element serves as the light source, and wherein the semiconductor device has a function of displaying an image by applying voltage to the light-emitting element.
33. The semiconductor device according to claim 21 , wherein a light-emitting element serves as the light source, and wherein the semiconductor device has a function of displaying an image by applying voltage to the light-emitting element.
34. The semiconductor device according to claim 26 , wherein a light-emitting element serves as the light source, and wherein the semiconductor device has a function of displaying an image by applying voltage to the light-emitting element.
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March 24, 2015
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